Panasonic WU-216MF2U9 - Service Manual - Page 179

P05, P15 Alarm, Alarm code, P15, P16, P26, Inverter compressor, HIC PCB

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3. 3WAY Alarm Codes 3WAY VRF SYSTEM Trouble Diagnosis P05, P15 Alarm Alarm code Alarm meaning Alarm conditions Probable cause Check Correction P05, P15 P05 : Open phase in power input is detected at HIC for 1st compressor. P15 : Open phase in power input is detected at HIC for 2nd compressor. This alarm occurs when open phase detected in the L1-L2-L3 phases. Open phase in the L1-L2-L3 phases Check the wiring at the power terminal board. Switch the phases and reinsert. Check if the result is OK. P14 Alarm Alarm code P14 Alarm meaning Input detected at EXCT terminal on indoor PCB for refrigerant detector. Alarm conditions (1) It is judged an error whenever the outdoor unit receives the signal "O2 Alarm Generated" from the indoor unit. (2) With the indoor unit's EEPROM setting (item code 0B) set to 0001, the EXCT input was 1 shorted. Probable cause - Check (1) System configuration 1-1 Is an O2 sensor being used? If "Yes", see "3-1". (2) Indoor EEPROM setting If "No", see "2-1". 2 2-1 Is the EEPROM setting, item code 0B, on the indoor control board set to 0001? If "Yes", change the setting of item code 0B to "0000" from "0001". If "No", see "3-1". (3) Indoor Unit Control board 3-1 Is the alarm triggered if the EXCT socket (wire) is disconnected, and the power is reset? 3 If "Yes", see "3-3". If "No", see "3-2 ". 3-2 Since there is no error, see what happens. 3-3 Indoor Control board defective → replace board Example - 4 Notes - P16, P26 Alarm Alarm code P16, P26 Alarm meaning P16 : O vercurrent of 1st compressor on the secondary side of inverter circuit, or inverter failed to syncronize with rotation. 5 P26 : O vercurrent of 2nd compressor on the secondary side of inverter circuit, or inverter failed to syncronize with rotation. Alarm conditions This alarm occurs when current trouble or current detection trouble occur (when trouble judgement current is detected in the secondary current). * Changed to output error by current regardless of the inverter frequency. Seccuorrnednat ry U V W 6 When more than the current values shown in the table are instantly detected in the secondary current. Secondary current HIC PCB Model name Current (A) U-72MF2U9 U-96MF2U9 U-120MF2U9 U-144MF2U9 30.0 44.0 30.0 30.0 7 Model name U-72MF2U94 U-96MF2U94 U-120MF2U94 U-144MF2U94 Current (A) 16.6 23.0 16.6 16.6 Inverter compressor Probable cause There is a strong possibility of a compressor failure. An alarm occurs for current detection trouble when it is judged that no current is flowing after Check start (DCCT is damaged). In this case, the cause is a DCCT failure. Check the power wiring and connector wiring. 8 Correction It is possible to resolve this trouble by limiting the maximum frequency. Example - Notes - 5 - 27 9

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5
- 27
5
3WAY VRF SYSTEM
Trouble Diagnosis
3. 3WAY Alarm Codes
P05, P15 Alarm
Alarm code
P05, P15
Alarm meaning
P05 : Open phase in power input is detected at HIC for 1st compressor.
P15 : Open phase in power input is detected at HIC for 2nd compressor.
Alarm conditions
This alarm occurs when open phase detected in the L1-L2-L3 phases.
Probable cause
Open phase in the L1-L2-L3 phases
Check
Check the wiring at the power terminal board.
Correction
Switch the phases and reinsert. Check if the result is OK.
P14 Alarm
Alarm code
P14
Alarm meaning
Input detected at EXCT terminal on indoor PCB for refrigerant detector.
Alarm conditions
(1) It is judged an error whenever the outdoor unit receives the signal “O
2
Alarm Generated”
from the indoor unit.
(2) With the indoor unit's EEPROM setting (item code 0B) set to 0001, the EXCT input was
shorted.
Probable cause
—
Check
(1) System configuration
1-1 Is an O
2
sensor being used?
If “Yes”, see “3-1”.
If “No”, see “2-1”.
(2) Indoor EEPROM setting
2-1 Is the EEPROM setting, item code 0B, on the indoor control board set to 0001?
If “Yes”, change the setting of item code 0B to
“0000” from “0001”.
If “No”, see “3-1”.
(3) Indoor Unit Control board
3-1 Is the alarm triggered if the EXCT socket (wire) is disconnected, and the power is reset?
If “Yes”, see “3-3”.
If “No”, see “3-2 ”.
3-2 Since there is no error, see what happens.
3-3 Indoor Control board defective
→
replace board
Example
—
Notes
—
P16, P26 Alarm
Alarm code
P16, P26
Alarm meaning
P16 : Overcurrent of 1st compressor on the secondary side of inverter circuit, or inverter failed to
syncronize with rotation.
P26 : Overcurrent of 2nd compressor on the secondary side of inverter circuit, or inverter failed to
syncronize with rotation.
Alarm conditions
This alarm occurs when current trouble or current detection
trouble occur (when trouble judgement current is detected
in the secondary current).
* Changed to output error by current regardless of the inverter
frequency.
When more than the current values shown in the table are
instantly detected in the secondary current.
Secondary current
Model name
U-72MF2U9
U-96MF2U9
U-120MF2U9
U-144MF2U9
Current (A)
30.0
44.0
30.0
30.0
Model name
U-72MF2U94
U-96MF2U94
U-120MF2U94 U-144MF2U94
Current (A)
16.6
23.0
16.6
16.6
Probable cause
There is a strong possibility of a compressor failure.
An alarm occurs for current detection trouble when it is judged that no current is flowing after
start (DCCT is damaged). In this case, the cause is a DCCT failure.
Check
Check the power wiring and connector wiring.
Correction
It is possible to resolve this trouble by limiting the maximum frequency.
Example
—
Notes
—
Inverter compressor
HIC PCB
U
V
W
Secondary
current